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A comparison of the sagittal and vertical dentofacial effects of maxillary expansion produced by a memory screw and a hyrax screw.
Aust Orthod J. 2016 May; 32(1):31-40.AO

Abstract

AIM

The aim of the present study was to investigate and compare the cephalometric effects of a conventional Hyrax expansion screw and a memory screw on the skeletal and dentoalveolar structures and soft tissues of the face.

METHODS

Thirty-two patients with a maxillary transverse deficiency were divided into two groups. A memory-screw group included 17 patients (nine females and eight males), while a Hyrax-screw group was comprised of 15 patients (eight females and seven males). The mean ages of the subjects in the memory-screw and Hyrax-screw groups were 13.00 ± 1.29 and 12.58 ? 1.50 years, respectively. Lateral cephalograms were taken of the patients at the beginning of the treatment (T1), at the end of expansion (T2) and retention periods (T3). The mean expansion period was 7.76 ± 1.04 days in the memory-screw group and 35.46 ± 9.39 days in the Hyrax-screw group. The Shapiro-Wilk Normality test was used to determine whether the investigated parameters were homogeneous. To determine the treatment changes within the groups, a paired test and Wilcoxon Signed Rank test were applied to the homogeneous and non-homogeneous parameters, respectively. A comparison between the groups was carried out using the Student's t-test for homogeneous parameters and the Mann-Whitney U test for all others.

RESULTS

A results summary indicates that mid-palatal sutural opening and subsequent important skeletal and dental expansions were obtained in all patients. The maxilla moved anteriorly and inferiorly in both groups while the mandible rotated inferiorly and posteriorly but to a greater extent in the memory-screw group.

CONCLUSION

The newly-developed memory expansion screw takes advantage of rapid and slow maxillary expansion protocols. The suture is opened and the maxilla expanded with relatively lighter forces over a shorter time. The RME using the memory screw resulted in similar sagittal and vertical changes to those produced by the Hyrax screw.

Authors

No affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial

Language

eng

PubMed ID

27468589

Citation

Halicioğlu, Koray, and Ibrahim Yavuz. "A Comparison of the Sagittal and Vertical Dentofacial Effects of Maxillary Expansion Produced By a Memory Screw and a Hyrax Screw." Australian Orthodontic Journal, vol. 32, no. 1, 2016, pp. 31-40.
Halicioğlu K, Yavuz I. A comparison of the sagittal and vertical dentofacial effects of maxillary expansion produced by a memory screw and a hyrax screw. Aust Orthod J. 2016;32(1):31-40.
Halicioğlu, K., & Yavuz, I. (2016). A comparison of the sagittal and vertical dentofacial effects of maxillary expansion produced by a memory screw and a hyrax screw. Australian Orthodontic Journal, 32(1), 31-40.
Halicioğlu K, Yavuz I. A Comparison of the Sagittal and Vertical Dentofacial Effects of Maxillary Expansion Produced By a Memory Screw and a Hyrax Screw. Aust Orthod J. 2016;32(1):31-40. PubMed PMID: 27468589.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - A comparison of the sagittal and vertical dentofacial effects of maxillary expansion produced by a memory screw and a hyrax screw. AU - Halicioğlu,Koray, AU - Yavuz,Ibrahim, PY - 2016/7/30/entrez PY - 2016/7/30/pubmed PY - 2016/9/16/medline SP - 31 EP - 40 JF - Australian orthodontic journal JO - Aust Orthod J VL - 32 IS - 1 N2 - AIM: The aim of the present study was to investigate and compare the cephalometric effects of a conventional Hyrax expansion screw and a memory screw on the skeletal and dentoalveolar structures and soft tissues of the face. METHODS: Thirty-two patients with a maxillary transverse deficiency were divided into two groups. A memory-screw group included 17 patients (nine females and eight males), while a Hyrax-screw group was comprised of 15 patients (eight females and seven males). The mean ages of the subjects in the memory-screw and Hyrax-screw groups were 13.00 ± 1.29 and 12.58 ? 1.50 years, respectively. Lateral cephalograms were taken of the patients at the beginning of the treatment (T1), at the end of expansion (T2) and retention periods (T3). The mean expansion period was 7.76 ± 1.04 days in the memory-screw group and 35.46 ± 9.39 days in the Hyrax-screw group. The Shapiro-Wilk Normality test was used to determine whether the investigated parameters were homogeneous. To determine the treatment changes within the groups, a paired test and Wilcoxon Signed Rank test were applied to the homogeneous and non-homogeneous parameters, respectively. A comparison between the groups was carried out using the Student's t-test for homogeneous parameters and the Mann-Whitney U test for all others. RESULTS: A results summary indicates that mid-palatal sutural opening and subsequent important skeletal and dental expansions were obtained in all patients. The maxilla moved anteriorly and inferiorly in both groups while the mandible rotated inferiorly and posteriorly but to a greater extent in the memory-screw group. CONCLUSION: The newly-developed memory expansion screw takes advantage of rapid and slow maxillary expansion protocols. The suture is opened and the maxilla expanded with relatively lighter forces over a shorter time. The RME using the memory screw resulted in similar sagittal and vertical changes to those produced by the Hyrax screw. SN - 0587-3908 UR - https://www.unboundmedicine.com/medline/citation/27468589/A_comparison_of_the_sagittal_and_vertical_dentofacial_effects_of_maxillary_expansion_produced_by_a_memory_screw_and_a_hyrax_screw_ DB - PRIME DP - Unbound Medicine ER -